Ultraweak fiber bragg grating array and Phi-OTDR combined optical fiber vibration sensing system
A fiber grating array and weak fiber grating technology, applied in the direction of measuring ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems of low detection range and sensitivity, and achieve the effect of improving signal-to-noise ratio and sensitivity
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Embodiment 1
[0039] An optical fiber vibration sensing system combining an ultra-weak fiber grating array and a Φ-OTDR, in which an ultra-weak fiber grating array is connected to the sensing fiber part of the optical fiber vibration sensing system. The spacing of the ultra-weak fiber grating array is the same as the spatial resolution of the system or an integer multiple of the spatial resolution. The signal returned in the sensing fiber is the superposition of the reflection signal of the ultra-weak fiber grating and the back Rayleigh scattering signal.
Embodiment 2
[0041] An optical fiber vibration sensing system combining an ultra-weak fiber grating array and a Φ-OTDR, in which an ultra-weak fiber grating array is connected to the sensing fiber part of the optical fiber vibration sensing system. Each ultra-weak fiber grating should be arranged at equal intervals in the sensing fiber. The spacing of the ultra-weak fiber grating array is the same as the spatial resolution of the system or an integer multiple of the spatial resolution. The signal returned in the sensing fiber is the superposition of the reflection signal of the ultra-weak fiber grating and the back Rayleigh scattering signal.
Embodiment 3
[0043] An optical fiber vibration sensing system combining ultra-weak fiber grating array and Φ-OTDR, the sensing fiber adopts ultra-weak fiber grating array. The spacing of the ultra-weak fiber grating array is the same as the spatial resolution of the system or an integer multiple of the spatial resolution. The signal returned in the sensing fiber is the superposition of the reflection signal of the ultra-weak fiber grating and the back Rayleigh scattering signal.
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